<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <title>v-pre</title>
</head>
<body>
<div id="app">
  <h2>{{ msg }}</h2>
<!--  作用就是不对msg做任何解析，原封不动的输出，用的是比较少的-->
  <h2 v-pre>{{msg}}</h2>
</div>
<script src="../node_modules/vue/dist/vue.js"></script>
<script>
  new Vue({
    el: "#app",
    data: {
      msg: "hello,world"
    }
  })
</script>
  </body>
</html>